Amprobe PRM-6 Phase Sequence and Motor Rotation Tester

(5 customer reviews)

  • 3-phase wire sequence indication
  • Error displays (missing phase, one input connected to neutral or PE)
  • Non-contact, wireless motor rotation detection on running motors
  • Indicates motor rotation of disconnected motors when spinning the shaft by hand or other means
  • 3-phase to phase voltage up to 700 V
  • Clear backlit LCD display
  • Durable rubber casing for 3 ft. (1 m) drop proof protection
  • Safety: CAT IV 600 V
SKU: 4375950 Category:


If you install or connect 3-phase motors and systems, you recognize the importance of verifying the correct motor rotation and wiring phase sequence. Improper connections can cause motors to rotate in reverse direction, potentially damaging the motor and the equipment it is powering.

The PRM-6 Motor and Phase Rotation Tester can test the motor rotation of 3-phase systems, and verify 3-phase receptacle wiring and phase sequencing with test leads.

An additional advanced feature is wireless motor rotation detection, which senses motor rotation direction without use of test leads. This is particularly useful for fast-running motors when the motor rotation cannot be visually determined or when the drive shaft is not visible.



Winner — NECA Showstopper 2015


General Specifications
Operating temperature 0°C to 40°C (32°F to 104°C)
Operating altitude Up to 2000 m
Power AAA battery (2)
3 phase indication LCD
Dimensions (H x W x D) 5.43 in x 2.56 in x 1.3 in (13.7 cm x 6.5 cm x 3.3 cm)
Weight .38 lb (.17 kg) including battery
Dust/water resistance IP 40
Pollution degree 2
Overvoltage category CAT IV 600 V
Agency approvals
Safety Conforms to EN 61010-1
EN 61010-031
EN 61557-1
EN 61557-7
EMC Conforms to EN 61326-1
Electrical Specifications
Rotary field detection
Voltage range (frequency) 40 – 700 V (16 – 60 Hz)
50 – 700 V (60 – 400 Hz)
Nominal test current < 3.5 mA
Non-contract rotary field indication
Frequency range 16 – 400 Hz
Motor connection (with leads)
Voltage range ≥ 1 – 700 V
Frequency range 2 – 400 Hz
Nominal test current < 3.5 mA


What’s Included

  • PRM-6
  • 3 test probes
  • 3 alligator clips
  • Carrying bag
  • 2 AAA batteries


Datasheet »
Product Manual »

5 reviews for Amprobe PRM-6 Phase Sequence and Motor Rotation Tester

  1. Dandaman

    Excellent instrument

    I like using this phase sequencer and showing it off to my co-workers. They are always impressed by the features especially shocked that you can check rotation of a motor by simply holder the unit next to the running motor.

    ✔ Yes, I recommend this product.

  2. Dannun78

    Bang for your buck

    I researched the different types of rotation tester, I thought I had made my mind up on a different brand, until I found the amprobe prm-6. This item is a must have for anyone working with motors. Definitely makes quick work of terminating motors. The features are unbeatable,and the feature of testing rotation without connecting leads is fantastic. Highly recommend this product without a doubt. Look at it this way if you are still trying to decide, save time connecting motors, which ultimately make more money by being more efficient and accurate.

    ✔ Yes, I recommend this product.

  3. Herb

    Wireless motor rotation is great

    I have to work on a university campus that nothing is the same in any building great for checking motors before turning off power and know when everything is rehooked it’s all correct.

    ✔ Yes, I recommend this product.

  4. Ben33

    Well worth the money

    This tool is great for troubleshooting equipment to make sure the motor is turning the right direction without having to tear all the guarding off, or when installing a new motor and you forget to check rotation before putting the guarding back on.

    ✔ Yes, I recommend this product.

  5. Mark

    The PRM-6 is great, a must have if you work with 3 phase to ensure the proper phase rotation.
    The non-contact feature is awesome when working with pumps and motors where you cannot see if the shaft is turning or there is too much vibration and noise to tell. Great trouble shooting tool. Great price for what it does. I have showed this tester to other people, and they went out and bought one for themselves.

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